In the library you can actually use the print editions of the Style Manual:
Online it is pretty much the OWL at Purdue. They have information and examples about the 7th edition as well as the 6th edition.
There is also quite a bit of help on the APA blog and APA's Instructional Aids page.
The APA Assistant comes to you courtesy of Miranda Kispert at Weber State University. Thank you, Miranda! It reflects the 6th edition of the Manual.